|Table of Contents|

Thermal damage of seawater and sea sand mortar after elevated temperatures(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年02期
Page:
11-18
Research Field:
建筑材料
Publishing date:

Info

Title:
Thermal damage of seawater and sea sand mortar after elevated temperatures
Author(s):
XIE Qinghai1; 2;  SUN Chengjian1;  XIAO Jianzhuang2;  ZONG Zhongling3
(1. School of Civil and Ocean Engineering, Jiangsu Ocean University, Lianyungang 222005, Jiangsu, China; 2. Department of Structural Engineering, Tongji University, Shanghai 200092, China; 3. Jiangsu Ocean Engineering Research Center for Intelligent Infrastructure Construction, Jiangsu Ocean University, Lianyungang 222005, Jiangsu, China)
Keywords:
seawater and sea sand mortar;  elevated temperature;  digital image correction method;  thermogravity analysis;  strength degradation;  microstructure damage
PACS:
TU528
DOI:
10.19815/j.jace.2021.11013
Abstract:
Natural seawater and sea sand were adopted to mix mortars with water-cement ratios of 0.40 and 0.47, and the mechanical behavior degradation and microstructure damage were investigated after elevated temperatures. Three-point bending and axially compression tests were conducted to obtain the changes of of flexural and compressive strength of seawater and sea sand mortar(SSM)after elevated temperature. Combined with digital image correlation(DIC)method, the deformation development process of SSM under three-point bending load was captured in real time. Thermogravity analysis was performed to measure the mass loss of seawater mixed cement paste under elevated temperatures. The microstructure damage of the paste after high temperature was observed and analyzed by scanning electron microscope(SEM). The results show that after high temperature, the flexural and compressive strength of SSM increase first and then decrease with the increase of temperature, and the degradation of flexural strength is larger than that of compressive strength. The established degradation formula of flexural and compressive strength is in good agreement with the test. DIC results show that under the same stress level, the higher the temperature is, the more fully the SSM mid-span strain develops, and the greater the mid-span deformation at peak stress. The thermogravity analysis results show that with the increase of temperature, the greater the water-cement ratio, the more the mass loss of the slurry. SEM results indicate the microstructure of paste becomes notably looser after higher temperature.

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Last Update: 2023-03-20